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Particle type
MERV 8
Standard
90% efficiency
FPR 5 · MPR 600
MERV 11
Advanced
95% efficiency
FPR 7 · MPR 1200
MERV 13
Superior
98% efficiency
FPR 10 · MPR 1900
Large particles
Dust mites10+ microns
Pollen10–100 microns
Lint and fabric fibers10+ microns
Medium particles
Pet dander5–10 microns
Mold spores3–10 microns
Fine particles
Fine dust1–3 microns
Smoke particles0.3–1 micron
Smog and fine particles0.1–1 micron
Biological particles
Bacteria0.3–5 microns
Virus carriers0.3–1 micron
Best for
Recommended use Basic air quality, standard homes Homes with allergies or pets Health concerns, superior air quality

How To Find Your Air Filter Size

Check the label on your current filter or use a tape measure to determine the length, width, and thickness. Just make sure you know the difference between nominal and actual size.

AIR
FILTER
← Width (16") →
Height (25") ↕
Nominal Size
16x25x1
16" Width
25" Height
1" Depth
Actual Size:
15.5" x 24.5" x 0.75"

📏 Nominal Size

The rounded size printed on the filter label. This is what you use when ordering — it's not the true physical size of the filter.

📐 Actual Size

The true physical size of the filter, usually printed in smaller font below the nominal size. Always slightly smaller than nominal.

📏 Measuring

Measure your current filter or the slot opening. Round up to the nearest whole inch to get the nominal size for ordering.

💡

Pro Tip: Always order by nominal size, not actual size. For example if your filter measures 15.5" x 24.5" x 0.75", order the 16x25x1.

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